Fuse



FUSE.

AVPLICAUUN FILED JULY 17.1919.

1,367,179. Patented Feb. i, mib

j?, f Z.

"nw y UNITED STATES PATENT oFFicE.

GEORGE E. CONRAD, 0F STILLWATER, MINNESOTA.

FUSE.

Specification of Letters Patent.

Patented Feb. 1, 1921.

Application led July 1'?, 1919. Serial No. 311.553.

- sity of taking the body of the fuse apart, by

simply loosening a pair of retaining screws.

A further object is the provision of a fuse having means by which the ller, of soft metal construction, may be normally protected and readily exposed toview, as well as one, the condition of which may be instantly determined upon inspection, without the necessity of test.

With these general objects, my invention resides in the features of construction, arrangement, and operation, to be now described with respect to accompanying drawing forming a part of this specification and wherein:

Figure 1 is a vertical longitudinal section through my fuse in its practical application.

Fig. 2 is a front elevation thereof.

Fig. is a cross section on line 3-3 of F ig. 2.

Fig. 4 is a front elevation of a slightly different form.

Figs. 5 and 6 are respectively a longitudinal section on line 5 5 and a cross sec- 11, projecting inwardly from end caps 13,-

the latter of which have annular flanges into which the ends of the shell 10 project and are secured by retaining screws 14. These end caps, which are closed at their outer ends, may be either plain as seen in vFigs. 4;, 5 and 6, to cooperate with curved retaining clips 15 for the fuse, or may have externally projecting axially extending blades 16 whose inner portions 12 are carried by the caps as seen in Figs. 1 to 3, 'for use in connection with flat retaining clips 17. One side port-ion of the inner shell 1li 1s cut away to provide a Clongitudinally7 slotted opening 18, through which the inner portions of the spaced axial posts 11 are eX- posed. The inner portions Vot these posts are cut away to present fiat seats into which /V clamping screws 19 are threaded for the purpose of holding upon the iiat seats. the opposite ends ot the soft metal, or their fuse connection 20, or what is commonly known as the fuse filler.

In accordance with my invention, the fuse iiller l20 is preferably in the form ot a flat strip having a lengthwise slot 21 at one end and a transverse slot 22 adjacent to the opposite end, so that by simply loosening the clamping screws 19, a used filler may be readily removed and a new filler substituted, by first slipping the latter at its longitudinally slotted end in connection with one of the clamping screws and rocking the same to engage its transversely slotted opposite end with the other clamping screw. Then by tighteningthe screws the renewal operationis complete.

Between the two end caps 13 and around the intermediate portion of the inner shell 10 is an outer rotatable shell 23, one side of which is cut away to provide a longitudinal slotted opening 24, which maybe shifted into and out of register with the similar opening 18 of the inner shell 10. Thus, when these openings are registered it is obvious that the filler 2() will be wholly exposed for inspection and to permit of its removal in case removal is found necessary and it is further obvious that inview'oic this Jfull inspection of the filler, the condition of the same may be readily ascertained so as to entirely avoid the necessity of test to de termine whether or not, it is in working condition, as is necessary in most instances with the fuses now in common use.

I claim:

A device of the character described in* cluding an inner cylindrical shell having end walls provided with central openings, end caps telescoping the ends oi said shell and having end walls abutting the endwalls of the shell, an outer shell encircling the Cli inner shell and confined in rotatable rela tion thereon between the end caps, and terminal posts integral with Vthe end walls of said caps and projecting axially therefrom and inwardly through the end wall openings of the inner shell, said posts havinpT their .inner ends spaced apart and provided With at fuse seats and fuse clamping screws,and

each of said shells having a single opening in its wall extending from one fuse seat to the other, said end caps having outer diaxnelrical grooves, and projecting bladesl hav` ing inner transverse "ribs Secured in the grooves of the end caps as described.

GEORGE E. ooNRAD. 

